Once Parliament has passed an Act, it then falls to the courts to apply the statute in a particular case. This can lead to difficulties where the facts of the case may not have been envisaged by Parliament or where there exist drafting errors or ambiguity in the statute. There exists The Interpretation Act of 1978 which provides certain basic definitions such as singular includes plural and he includes she. In addition the courts have developed rules to assist judges in interpreting statutes.